The closest major section is a roundabout, sort of. It links Route 1 and 95.

I drove by the place again about an hour ago, and it's a few minutes south of the Foxborough town line. It's at least three or four stories tall, and there are large windows along the ground floor level, many of them arched. That doesn't fit with it being a warehouse, a Costco, a BJ's, or a Sam's Club. Nor does it fit with being a mall! Not that I would expect anyone to be building a mall these days, what with the retail apocalypse and the Emerald Mall (and most others) going down the drain!